Screen



Feb. 20, 1934.

c. H. NORDELL. 1,948,125

SCREEN Filed April 11, 1932 2 Sheets-Sheet 1 Feb. 20, 1934.

c. H. NoRDELL 1,948,125

SCREEN Filed April 11. 1932 2 Sheets-Sheet 2 4Z/- 25 25 30 l? 22 Q z5 l5 j@ l 25u/enjoin" Patented Feb. 20, 1934 UNITED STATES PATENT OFFICE 1,948,125 Y SCREEN Y Carl H. Nordell, Chicago, lll. Application April 11, 19am.V serial No. 604,511.

i claims. (ci. zio- 152) lishments water from streams, lakes and other pools, is employed for various purposes, and the screen has been designed for use in situations of this kind. D

The diiilculty encountered withscreens heretofore used is that of preventing the screens from becoming clogged, and various expedients have been resorted to with a view towards re- `moving this objectionable feature. One of the objects of the present invention is to provide a screen havingl continuous openings therein,

vwhereby the openings are constantly kept clear,

thereby leliminating' anypossibility of clogging,

.Another object is to provide a screen constructed of similar unitswhich may be'readily assembled to provide a screen for any desirable capacity and to provide a screen having openings a of any desirable size. A `Another object is to provide a screen which is strong, substantial and capable of withstand- '80 i118 the hard usage to which screens of Athis character are usually put. l

To lsuch endsthis invention consists in a screen composed of a multiplicity of ring-like screen units secured together and sintably spaced `apart to provide continuous openings therebetween, in combination withcleaning means entering the spaces between bf said elements being rotatable relative/to the other, whereby the spaces between the rings are constantly kept free from the material which is being separated from the water, and which ordinarily collects in the screenopenings.

The invention further consists in a. screen composed of spaced ring-like screen units secured together and providedwith a. hub within the hollow of the screen and connected with one end thereof. l

The invention further consists in a screen composed of ring-like units secured together and having means on'the exterior of the ringsv for breaking up solid material which is carried tothe'screen. 4'

The invention further consists in the several novel features of construction, arrangement and combination of parts hereinafter fully set forth and claimed.

The invention is clearly illustrated in the drawings accompanying -this specication in which- 00 UPigure l is a the ring-like units, one

and partly invertical section, of a screen embodying a simple form of the. present invention and showing the samev applied to the conduits which convey the water to and from `the screen, v

the line of section -being indicated at 1--1l in' Fig. 2 is a horizontal section,- the line of section being inf dicated at 2-2 in Fig. l;

Fig. s is a' detail fragments view of me' screen, partly in side elevation. and partly in vertical section;

vview, partly inplan and partly inv" Fig. 4 is a view, partly in plan partly in horizontal section, vtalrenon the line 4:-4 of Fig. 3; v

takenon the line 5-5 of Fig. 4; v

Fig. 6 is a fragmental plan of thescreenillus trating an additional feature; and` Fig. 'l is a fragmental side elevation of the screen seen inl Fig. 6.7

Referring to said drawings, -and first to 1 to 5,v inclusive, the'reference character A designates an influent channel through which the unscreened water is conveyed to the screen, and B designates the emuent channel through which the screened water is conveyed away therein-inn.`

Fig. 5 is a. demi rragmental verticai'secuon These channels may be in the form of concrete' structur if desired, and may be of any'desir#- able form for conveying water or-other liquids.

The eiiluent channel leads from and is locate ed below the influent channel and is connected thereto through an opening 9 which is protected by thescreen proper, shown generally at 10. At the end of the influent channel A 'is a pocket 1l wherein the debris, trash and other solid matter carried along by the iniluent water is deposited and from which it is removed by suitablev mechanism (not shown). j i l Supported upon the bottom wall 12 of the influent channel is a standard 13 of strongI and substantial construction which is formed with a bearing bracket 14 overhanging the opening 9 j and adapted to contain bearings for the screen 'shaft 15. Extending over and flttedeinto the opening 9 is an annular base 1 6 wliichis formed as a part of the standard 13. The screen extends upward from said annular base and rotates therein.

Thefbearing bracket 14 projects down into the hollow of the screen and the latter is provided withfa hub l'lvsecured to the screen shaft 15 able source of power, and it is here shown driven directly. below thev lower end oi' the bearing bracket 14. The screen is driven from any suitl.

from an electric motor 18 mounted upon the top ofthe standard 13 and provided with speed reducing gearing '19, the low speed shaft shaft coupling 21.

20 0I, which is connected to the screen shaft l5 by a view, partly in side elevation rality of ring-like screen umts 22 spaced' apart by interposed washers. 23 and secured together by rods or long bolts 24 having nuts 25 upon .their .ends engaging with the outermost' screen units. 'Ihe washers 23 are located inwardly some distance fromthe peripheral edges of the screen units so as to leave free annular spaces outwardly of the washers into which extend the teeth 26 of a comb 27 which is bolted or other-f Wise secured to the standard 13.

'Ihe sides 'of the screen units are desirably parallel with each other for some distance' inward from -the outer periphries of the screen units beyond which they are relieved, as isillustrated at 28 in Fig. 5a'nd the teeth 26 of the` comb are tted to said .free spaces and serve to. clean said spaces from any material that might otherwisetend to lodge or collect therein and clog the screen. Desirably the teeth of the comb are disposed in a tangential direction with respect to the screen to facilitate the removal of any matter that encounters the teeth.

-The screen units,with th-exception of the uppermost one, are .similar in construction and are machined accurately to size and shape. The uppermost screen unit 29 is formed with a spider 30 which' extends down into the hollow.

of thescreen toward the middle thereof where the arms of the spider are united to the hub 17.

In operation, the screen is rotated in the direction of the arrow afin Fig. 2, and the water passes through the spaces between the screen units into the hollow of the screen and discharges through the opening 9.into the eiliuent channel B. 'Ihe water is not permitted to enter the screen throughits open top.v Any solid matter which is tooI large to pass through the spaces between the screen units discharge into the pocket 11 from which it is removed by any suitable` means. Any matter which tends to col-'- lect in the spaces between the screen units encounters the teeth of the comb and is removed from the screen. De irably the screen is rotated at a relativelygh speed, as, vfor instance, sixty revolutions per` minute, andv fromthis' it will be observed that the openings in the screen are eectively and continuously kept clear,

' thereby preventing 4 any foreign matter `from clogging-the screen.

The screen is very easily'assembled and may 'be constructed of any desirable length. Moreover, by selecting washers-of the proper thickness the sizes of the openings may be regulated to 'suit any particular requirement.

With the 'use of the continuous free spaces between 'the screen" units, a-rigid toothed comb may be used tokeepl the spaces clear of foreign .matter which is not possible 4where the screen openings are in the form of slots or other restricted openings. Moreover, since the screen maybe -rotated'at a comparatively highspeed the entirescreen opening may be'cleared once every second or -thereabout, thus effectively preventing any clogging ofthe screen.

In the form` .of the invention illustrated in Figs. 6 and 7, sharp cutting teeth 31 are screwed or otherwise fastened-to the outer faces of the screen units 22 and serve to break up debris, trash 'or other solid matter which is too large to pass through the spaces between the screen units, and, at the same time, the teeth 26' of A. the comb 27 servel to clear said spaces, asin the ypreferred form. In thisgcase, the spaces between the teeth of the comb 27 are made sumcienuy deepto permit the cutting teeth 31 w pass therethrough.

It will be understood that any material caught to exact size after the screen units have been units machined assembled. AAs a result a close nt may. be had',

between the teeth of the' comb and the sides of the screen unit without any dangerv of binding.

I claim as new.

and desire to secure lby* Letters Patent; A

1.- A' lscreen comprising a rotatory drum-like screen composed of spaced apart ring-like screen units rigidly secured together and having cutting teethk upon their 'outer peripheries, and a stationary mounted comb. having teeth entering the spaces between the screen units.

2. A screen comprisingl a rotatable straining wall ladapted to be interposed in a. flowing stream containing solids, said wall having lopenings Vtherein permitting liquid and material of small enough size to' pass through said openings in the wall, a conduit in which the straining wall is interposed and'through which the stream iiows, the Wall of s aid conduit serving to retain the strained out material in'the stream, and submerged comminuting means carried in part by said wall for reducing the strained out ma` terial into small enough size to passl through said openings along with the iiow of the liquid.

3. A screen comprising in combination arotating. slotted cylindrical straining wall adapted to be interposed in a flow of sewage for intercepting solids of -a larger size than will pass throughthe slots in said wall, and comminutlos yexterior. of the cylinder straining walland the other part of which isstationarily mounted, cooperating to Areduce the lintercepted solids- 4to small enough size .to pass through the slots along with the iiow of liquid. l

4. The method of straining sewage which consists in straining out solids from liquids in a' flowing stream. and comminuting the intercepted solids below the -surface of the stream without removing the intercepted solids from the stream, whereby the comminuted solids may pass through the straining-means along with the llow of liquid. v 5.=A screen, comprising a cylindrical straining wall adapted to be .interposed in 'a owing stream containing solids, said wall having cir-- cumferential slots therein, permitting liquid and material of small enough size topass through,

a comb having teeth entering said slots, the

wall and comb being relatively rotatable whereby the teeth of the comb rid said slots .of accumulated matter, and comminuting means mounted on the outer face of the.wall co-operating rwith the comb to reduce the strained out material to small enough size to pass through thel slots in the wall. v

Y CARL H. NORDELL.. 

